Air pollution in us national parks is affecting the environment in what way

What body of water is the second cataract of the nile river submerged under

Most tornadoes carry winds speeds in a range of km per hour

In an effort to japan recover from the devastating effects of the 1929 depression, japanese military leaders in the 1930s formed an alliance with nazi germany negotiated more trade treaties with the soviet union closed its doors to western trade adopted a policy of imperialist expansion